My experience says that if you have a mounting flange, you do not get / need a retainer ring..... Don't ask me why...... Right answer..... Grimes will fix it all up for you and make it make sense.... Frank Filippone red735i@xxxxxxxxxxxxx I see now what happened: the local guy that drilled the hole in my lensboard didn't really understand what he was doing, and he put the mounting flange on the back instead of on the front. There is no retainer: that's the part that's missing. I will send the whole job to SK Grimes. --shannon ============================================================================================================= To unsubscribe from this list, go to www.freelists.org and logon to your account (the same e-mail address and password you set-up when you subscribed,) and unsubscribe from there.